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Time-bin entangled photon pairs from quantum dots embedded in a self-aligned cavity.
Optics Express
|March 27, 2021
Summary
We developed a scalable photonic platform for efficient entangled photon pair generation using semiconductor quantum dots. This breakthrough simplifies fabrication and significantly boosts collection efficiency for quantum information applications.
Area of Science:
- Quantum Optics
- Solid-State Physics
- Nanophotonics
Background:
- Efficient generation of entangled photon pairs is crucial for quantum information processing.
- Existing methods often require complex nanofabrication and suffer from low collection efficiencies.
Purpose of the Study:
- To introduce a scalable photonic platform for efficient entangled photon pair generation.
- To overcome limitations of current fabrication techniques and improve collection efficiency.
Main Methods:
- Utilized a self-aligned quantum dot-microcavity structure.
- Experimentally demonstrated device performance including collection efficiency and Purcell enhancement.
- Generated time-bin entangled photon pairs.
Main Results:
- Achieved a collection efficiency of 0.17 and Purcell enhancement up to 1.7.
- Generated time-bin entangled photon pairs with a fidelity of 0.84(5).
- Demonstrated a pair collection efficiency 4 times higher than the state-of-the-art.
Conclusions:
- The developed platform offers a simplified fabrication approach for quantum dot-based entangled photon sources.
- The device shows significant potential for implementing bright sources of various entangled photon types (time-bin, polarization, hyper-entanglement).
- The system promises high pair extraction efficiencies, approaching 0.5 theoretically.
